412 



IV AR BROMAN, 



posite the origin of the branches which pass towards the Spina, 

 cord. The anterior branches, which are quite small. arise bet- 

 ween the seventh end eight cervical nerves, and pass directly 

 to the anterior end of the Wolffian body. Back of this pair 

 the branches are of about equal size, the last being in front 

 of the first lumbar nerve." 



„On the ventral median line of the aorta there are two 

 distinct branches, — coeliac axis and the omphalo-mesenteric. 

 At the fourth lumbar several small branches are given off from 

 the ventral side of the aorta, and break up into a capillary 

 network which extens throughout the mesentery." 



,,Although the branch to the stomach and liver has already 

 all its relations to these organs, as the coeliac axis in the adult, 

 its origin is far too far forward. Other embryos, however, de- 

 monstrate that the origin of this vessel is constantly shifting as 

 the following table shows: — 



,,It is only left for us to conclude that the stomach, liver 

 and pancreas receave their artery while the lie dorsal to the 



